Jar coupling for oil-well casings



July 3, 1923.

J.- G. BURCH JAR COUPLING FOR OIL WELL CASINGS Filed Feb. 26 1921 Patented July 3, .1923.

JULIUS GORDON BURCH, OF BARTLESVILLE, CKLAHOMA.

JAR COUPLING FOR OIL-WELL GASINGS.

Application filed February 26, 1921. Serial in; 448,264.

To all whom it'mag concern: Be it, known that I, J ULTUS GonooN BURCH,

a citizen'of the UnitedSta'tes, residing at Bartlesville, in the county of \Vashington and State of Oklahoma, have invented certain new and-useful Improvements in Jar Couplings for Oil-.Well Casings, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to jar couplings for use in coupling sections of well casings.

An important object of the invention is to provide a device for'connecting the lower length of a string or casing pipeto the remainder of the string so that the upper section of the string ismovable through certain limits with relation to theZ/lower section in order that the upper section of the pipe,-

which is usually readily movable,may be shifted independently of the lower section.

A furthenobject is to provide in combination with such a movable coupling, a pair of opposed shoulders one of'which is fixed in relation to the lower-section of the casing, the other of the 'shoulde being fixed in relation to the upper sertion of the casing,

so that when the upper section is shifted a predetermined distance these shoulders engage. By this engagement a jar may be applied to the lower section to loosen the same from accumulated dbris at the bottom of the bore.

A further-object of the invention is to provide: a coupling of the character above set forth in which the continuityof the inner bore of the casing is not materially affected ih or'der' that an under reamer may be inserted within the casing and pass there through without obstruction.

A further object of the invention is to provide a coupling of this character embodying a valve and valve seatshould'ered construction preventing the entrance of water to the interior of the casing,and further-embodying an expansible gasket-member which when the coupling sections are in the position which will be assumed when the casing is standing in the well, engages the wall of'the bore or supplemental casing in which the casing properis. disposed to prevent downward passage of water. from points above the coupling.-

Other objects and dvantages'of the invention will become apparent throughout the course of the following description.

In the accompanying drawings wherein fon the purposeof illustration is shown a preferred embodiment of my invention, and wherein like reference characters designate like parts throughout:.

Figure 1 is a longitudinal sectional. viewtaliren through a well casing having the sectlons thereof connected by my coupling a'nd showing the coupling in the lowered poi n;

coiglpling sections in the extended position, an

Figure 3 is a section on the line 33 of Figure 2; I

Referring now more particularly to the drawings, the numeral 10 indicates an outer sleeve interiorly screw-threaded at its lower end for the reception 'of'the screw-threaded upperend of the lower section 12 of a well casing. The inner bore of the sleeve 10 is of slightly greater diameter than the interior bore of the casing 12, as-indicated at 13. At a point spaced from the lower end of the sleeve 10, the bore thereof is enlarged, as indicated at 14, this enlarg ment ofthe bore forming an annular sho lder'15,-: the purpose of which will resently appear. The upper end of-the s eeve is interiorly screw-threaded, as indicated at 16.

The numeral 17 indicates an inner sleeve which is reduced and exteriorly screwthreaded at its upper-extremity, as at 1 8, for coaction with the screw-threads of a pipe collar 19 whereby it may be connected to the lower end of the upper section 20 of the well easing.

The sleeve 17 is reduced, as. indicated at 17 and is. provided at its lower extremity with an enlargement having a ground face 21 forming a tight joint with the shoulder 15' formed upon the interior of the sleeve 10, the outer face ofthe enlargement having a sliding engagement with the interior of the sleeve 10 in the enlarged bore 14 thereof.

Figure 2 is a similar section showing the The upper faceof the enlargement forms a shoulder 22 which opposes a similar shoulder 22 formed-by the reduction'of the sleeve 17.

The enlargement forming the face 21 and shoulder 22 is inserted within the bore14 of the sleeve, and an exteriorly threaded split. 0011 r 23 assembled about-the-reduced por- .the upper face of thesleeve 10 being prefer-- lot ably flush. About the reduced portion 17.

above the split collar is arrangeda gasket 24 formed of a sleeve of rubber or similar material normally closely fitting thereduced portion 17 of the sleeve 17. When the device is employed in the casing and the weight of the upper section of the casing released to brin the weight thereof'to bear upon theinner s eeve, this sleeve moving downwardly within the outer sleeve causes the gasket 24 to bexengagerdbetween the shoulder 22 and the upper surface of the split ring23 and to be expanded so that it engages the wall 25 ofl the bore of the well, or of the supplemental casing which may be employed, ef fectually sealing the bore at thispolnt to prevent downward passage of water and the ike.

As is well known to those familiar with the art, the lower section of a well casing when left standing for a considerable period of time becomes very firmly imbedded in the bore by 'the falling particles of earth and a. collection of moisture and is very difiicult to move. This packing or imbeddlng does not usually extend above the lower section and consequently the upper sections oikmovement In emthe pipe arevery easily removed. ploying my invention, if it is found that the lower section is not readily moved when the shoulder 22 comes into engagement with the'under face of the split collar, the upper section of pipe may be loweied and reciprocated so as to bring this shoulder 22 into stroke engagement with the split collar, exercisin upon the lower section a hammering e ect in an upward direction so that *the same may be loosened from its bud. In

y emthe order that the under reamers usual ployed in the drilling of wells, and which embody expansible jaws, may not have the jaws thereef expand within the coupling and so limit the downward move 7 under reamer, I prodide upon the 10 er end of the inner sleeve 17 a depending skirt'26 slidably engaging the side walls of the lower portion of the outerisleeve 10. 'llhislskirt is Vof suflicient length to permit its bridging distance between the lower end of the innersleeve 17 .and the, upper end of the small bore 13 of the outer sleevewhen-tlie inner sleeve is in elevated position,- The skirt 26 will be made of very thin material,

about one-eighth inch, and will not therefore allow of sufficient' expansion of the under reamer to prevent the downward move.- nient of the .under reamer. A v

believed to be From the foregoing it is obvious that I have constructed a jar coupling for use in connection with oil well casings which is particularly well adapted for-the use for which it is intended because of the simplicity of the construction there-' of and because of the fact that it assists'i'n preventing the suction of dbris about the v with either thereo an f the aeeoaev lower end .ofthe casing and permits of exercising a hammering effect upon the lower It will furthermore be obvious that the 7 construction as hereinbefore set forth is ca- .pable of some change in modification without materially departing fromthe spirit of my invention, and I accordingly do not limit myself to the specific structure hereinbefore set forth except as hereinafter claimed.

What I claim -is:' v

1. A well casing jar coupling compris ing a. pair of telescoping sleevcs'each adapted for connection with a casing section, one of said sleeves embodying a pair of spaced shoulders, an enlargement formed on the other of said sleeves and freely operable intermediate said s lders and 'engageable one of said sleeves and coacting with the other of said sleeves for maintaining continuity of the casing bore during relative of the sleeves.

'a pair of telescoping sleeves provided with opposed shoulders, and means carried by one of the sleeves for preserving continuity of the bore during relative movement of the sleeves. y c

3. A well casing jar coupling comprising a pair of telescoping sleeves provided with opposed shoulders, and a skirt carried meanscarried by 2. A well casing Jar coupling comprising by one of said sleeves and coacting with V themther sleeve to preserve continuity of -the bore during relative reciprocation of the sleeve sections. v

4:. A well casing jar coupling comprising an outer sleeveadapted at one end for engagement with a casing section, the bore of said sleeve being enlarged at a point spaced from said end to provide a shoulder, an inner sleeve having an enlargement slidably engaging in the enlarged bore of the outer sleeve, and a collar secured to said outer sleeve and-slidably engaging the periphery of the inner sleeve, the collar and shoulder of saidouter sleeve being spaced apart a distance greater than the length of said enlargement, .and a skirt carried by one of said sleevesand bridging the gap between the. enlargement and shoulder when said enilprgement is in engagement with said co ar. 7

5. In a well casing jar coupling, an outer A adapted at one end for engagement with a casing and having an enlargement slidably engaging in the enlarged bore of the outer sleeve, a collar secured to said outer sleeve and slidably engaging the periphery of the inner sleeve, the collar and shoulder of said outer sleeve being spaced apart a distance greater than the length of said enlargement, and. a skirt formed on said inner sleeve and slidably engaging the main bore of said outer sleeve, said skirt bridging the gap between said enlargement and said shoulder when said enlargement is in engagement with said collar. 7

6. A well, casing comprising upper and lower sections, and a connection between the sections permittin limited relative shifting movement of't e sections whereby said upper section may be reciprocated to impart a jar to said lower section to free the same from collected matter in the bore of a well, said connection embodying means preserving the continuity of the bore of the casmg.

In testimony whereof I hereunto aflix my 

